A nurse is reinforcing teaching with a client about the oliguric phase of acute kidney injury. Which of the following information should the nurse include in the teaching?

A. The oliguric phase lasts for 2 days.: The duration of this phase is typically 10 to 14 days, though it can persist for several weeks. A 2-day timeframe is insufficient for the significant renal parenchymal recovery required to transition to the diuretic phase. Prolonged oliguria is associated with a poorer prognosis for the restoration of baseline renal function. B. The oliguric phase begins within 1 month of the injury.: This phase typically manifests within 1 to 7 days of the initial insulting event to the kidneys. A delay of 1 month would be inconsistent with the clinical progression of acute kidney injury. Rapid onset of decreased urine output is a hallmark of early stage renal tubular compromise. C. The client's urine output is less than 400 mL per 24 hours.: Oliguria is clinically defined as a total daily urine volume insufficient to excrete metabolic waste products effectively. This reduction in output results from a severely diminished glomerular filtration rate and cast formation obstructing the renal tubules. Monitoring for this specific volume threshold is essential for diagnosing the severity of the injury. D. The client's BUN and creatinine decreases during this phase.: Blood urea nitrogen and serum creatinine levels rise significantly during the oliguric phase due to the lack of renal clearance. The accumulation of these nitrogenous wastes leads to the clinical syndrome of uremia. Decreasing levels are only expected once the client enters the recovery phase of the disease.